德国BMT 932-C 多通道壁挂式低浓度臭氧检测仪 查看更多

拆卸安装大型电动机上的槽轮连接器等其它套装

As soon as he had spoken, the Tin Man began to chop, and in a short time the tree fell over with a crash, whereupon the Scarecrow's clothes fell out of the branches and rolled off on the ground. Dorothy picked them up and had Winkies carry them back to the castle.

光纤滑环是什么
，起到什么作用 ？